Add image_8 graphic

NOTES_ON_OPTICAL_PRINTER_TECHNIQUE.md

@@ -373,7 +373,7 @@ Figuring out how to do these is a good exercise for the student.
 The two non-sham emulsion positions are sketched again,
 this time with emulsions facing in shown dotted.
 
-**![Two graphics depicting CAMERA ORIGINAL and CONTACT PRINT FROM CAMERA ORIGINAL](#)**
+**![Two graphics depicting CAMERA ORIGINAL and CONTACT PRINT FROM CAMERA ORIGINAL](img/image_7.jpg)**
 
 Notice that when pictures "read right" single perfs are on the left, and "before" is above.
 
@@ -439,7 +439,7 @@ A filter which absorbs the ultraviolet, such as Wratten 2B or 2E improves sharpn
 
 Also, printing color film onto color film, or B&W film onto color film, there is color reproduction advantage to using a UV filter.
 
-Some color rawstooks have such filtration built in, some don't.
+Some color rawstocks have such filtration built in, some don't.
 
 Even printing color film onto B&W film there is tonal advantage to using a UV filter.
 
@@ -915,7 +915,7 @@ Example:
 
 > 4 has density .75 and B has density 1.75 in one place. From the first graph, the double exposure from positives has density about 1.0 in that place.
 
-**![Graphics depicting DOUBLE EXPOSURE FROM POS'S, BIPACK (1.0 COMPENS) DOUBLE EXPOSURE FROM NEGS and GAMMA 1/2 BIPACK](#)**
+**![Graphics depicting DOUBLE EXPOSURE FROM POS'S, BIPACK (1.0 COMPENS) DOUBLE EXPOSURE FROM NEGS and GAMMA 1/2 BIPACK](img/image_8.jpg)**
 
 For a double exposure it doesn't matter which exposure is first, or what time separates the two.
 In some multi-head optical printers, using a beam-splitter, the two exposures are simultaneous.

html/index.html

@@ -349,7 +349,7 @@
 <p>Given a double perforated (I), (II), (III), or (IV) it is easy to make a double perforated optical print which is any of the four.</p>
 <p>Single perforated films are a pain in the side. Given, for example, (IIIa), it is possible with a usual optical printer to make either (Ib), (IIb), (IIIa), or (IVa), but none of the other four. These could be made via a double perforated intermediate. With a prism or other image rotator, or a special reversed gate, it is possible to convert any of the eight ways to any of the eight ways. Figuring out how to do these is a good exercise for the student.</p>
 <p>The two non-sham emulsion positions are sketched again, this time with emulsions facing in shown dotted.</p>
-<p><strong><img src="#" alt="Two graphics depicting CAMERA ORIGINAL and CONTACT PRINT FROM CAMERA ORIGINAL" /></strong></p>
+<p><strong><img src="../img/image_7.svg" alt="Two graphics depicting CAMERA ORIGINAL and CONTACT PRINT FROM CAMERA ORIGINAL" /></strong></p>
 <p>Notice that when pictures “read right” single perfs are on the left, and “before” is above.</p>
 <p>Notice that camera original reads right with emulsion facing away. Contact print of camera original reads right with emulsion facing toward the viewer.</p>
 <p>Except when optical printing is done in alliance with contact printing, it is usual to maintain emulsion position through all optical printing steps. Starting with camera original each generation is again (IIIa). For this there is a simple rule.</p>
@@ -377,7 +377,7 @@
 <h2 id="uv-filter">UV FILTER</h2>
 <p>A filter which absorbs the ultraviolet, such as Wratten 2B or 2E improves sharpness with almost all lenses.</p>
 <p>Also, printing color film onto color film, or B&amp;W film onto color film, there is color reproduction advantage to using a UV filter.</p>
-<p>Some color rawstooks have such filtration built in, some don’t.</p>
+<p>Some color rawstocks have such filtration built in, some don’t.</p>
 <p>Even printing color film onto B&amp;W film there is tonal advantage to using a UV filter.</p>
 <p><a name="ir-filter"></a></p>
 <h2 id="ir-filter">IR FILTER</h2>
@@ -1172,7 +1172,7 @@
 <blockquote>
 <p>4 has density .75 and B has density 1.75 in one place. From the first graph, the double exposure from positives has density about 1.0 in that place.</p>
 </blockquote>
-<p><strong><img src="#" alt="Graphics depicting DOUBLE EXPOSURE FROM POS’S, BIPACK (1.0 COMPENS) DOUBLE EXPOSURE FROM NEGS and GAMMA 1/2 BIPACK" /></strong></p>
+<p><strong><img src="../img/image_8.svg" alt="Graphics depicting DOUBLE EXPOSURE FROM POS’S, BIPACK (1.0 COMPENS) DOUBLE EXPOSURE FROM NEGS and GAMMA 1/2 BIPACK" /></strong></p>
 <p>For a double exposure it doesn’t matter which exposure is first, or what time separates the two. In some multi-head optical printers, using a beam-splitter, the two exposures are simultaneous. Either way, the two films can be independently adjusted for exposure, filtered, etc.</p>
 <p>For a bipack it doesn’t matter which film is in front. Also the two may be optically instead of mechanically bipacked. In some multi-head optical printers the films are in separate gates, ones projection becoming the other’s illumination. In a simple printer one film may be in the gate and the other in the camera, in front of the print film. Any way, the two films ehare one exposure adjustment and filtration.</p>
 <p>When films will be physically bipacked they should first be wiped with a lubricating film cleaner. This is good practice for all optical printing when delicate originals receive heavy handling.</p>

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